I currently try to get a network registration with HE910 (FW 12.00.004), but when I read the Network Registration Report with "AT+CREG?" I always get "+CREG: 1,0" as reply. What is wrong, especially why is <stat> always 0?

I still checked the funcitonality of the SIM card. In our device working with GC864 Quad V2 it works fine.

If we set up a new connection from the Start menu, using:Start–>Settings–>Network and Dial-up Connections–>Make New Connectionand select Dial-up Connection, then Next, and select the main Telit port(COM6:, but actually COM5: on our platform, as we have relabelled the ports),and accept the default settings. Then when we open the port usingCreateFile, and send ‘AT’ using WriteFile, the ReadFile file returnsa count of zero bytes, with nothing in the buffer.

If the platform is reset, and we open the port before going into the Make New Connection dialog, then ReadFile returns ‘OK’ as expected.

Why does setting up a connection to the main Telit modem port preventthe serial file ReadFile from working?Note that CreateFile, WriteFile and ReadFile always give a return valueindicating a successful call. That is, no errors are indicated.

i work in online mode. In this case I must close the online mode with “+++”. After that i could check the state, but i cant. The module do not answer any command. The line “+++” is not recommended from the module. The cts is always high. Please understand it is not possible to check the connection state, because i dont get a answer to “+++” and the following AT commands.

The hardware flow control work but there is a case where the module dont leave the cts high state.

!!! I get a answer from the module, when i make a hard restart … i must leave the power form the module.The problem is not an isolated incident that happens with other HE910 modules.Do you have any idea.Thanks,Eric

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